GROSS ANATOMY
HEART MEDIASTINUM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
approximately one-third of the mass of the heart is to the left of the midsternal line
|
|
|
the heart extends from the 2nd rib to the 5th rib
|
|
|
the typical human heart weighs about 5 pounds
|
|
|
the heart lies posterior to the vertebral column
|
Detailed explanation-1: -Position and Shape of the Heart The heart is located in the thoracic cavity in between the lungs, 60% of it lying to the left of the median plane. The heart’s lateral projection extends from rib 3 to 6. Most of the heart’s surface is covered by the lungs and in juveniles it is bordered cranially by the thymus.
Detailed explanation-2: -The heart is located within the rib cage, under and slightly to the left of the breastbone (sternum). It approximately the size of a clenched fist. The lungs surround the right and left side of the heart.
Detailed explanation-3: -The apex (the most inferior, anterior, and lateral part as the heart lies in situ) is located on the midclavicular line, in the fifth intercostal space. It is formed by the left ventricle. The base of the heart, the posterior part, is formed by both atria, but mainly the left.